Tagged: Logging & SD cards
- May 15, 2016 at 12:05 pm #9740Robert RalstonGuest
My main use will be data logging to the micro SD card.
Has anyone tried glueing a plastic extender to a micro SD card so it could be inserted and removed without taking the case apart?
Or is there a “long” microSD card out there?
Or is there a way to download the card data to a desktop?
- May 16, 2016 at 11:29 am #9746
The slot on the side of the Mooshimeter is closed because we had to make some last minute safety improvements for measuring high voltages, you can read about that here:
To remove the SD card you need to remove the bottom half of the case. After that you can remove the SD card and download the data. The logs are stored as CSV files compatible with any spreadsheet program.
- May 30, 2016 at 10:27 am #9867AnonymousGuest
Thank you for the link explaining why the microSD card slot had to be closed up.
a. Are there plans for an app running on a desktop (Mac preferred but would use Windows10) which can connect by BT and allow download of the microSD card data?
b. Are there any plans for a much slower sampling/writing to SD rate, like once every ten seconds? The higher sampling rates are very useful but a much slower rate would also be very useful.
- May 30, 2016 at 4:44 pm #9877
Yes, I have plans for this, realistically I think this is a few months away though. Mac support would be first because Apple was smart and uses the same CoreBluetooth library in iOS and OSX, so the Max application is mostly a matter of re-jiggering the iOS app.
This should already be supported, but you may need to do a firmware update (not sure what version of meter firmware and iOS/Android apps you’re running). From the main “metering” page with the numerical outputs, there is a settings icon in the top right. This will show you a page of preferences where you can set the logging interval.
Hope this helps, best
- June 3, 2016 at 9:46 am #9930AnonymousGuest
Thank you. I had not noticed the logging interval settings.
Bravo for making a useful, affordable, supportable, useful instrument. Oh, and did I mention useful. Bravo guys.
- June 6, 2016 at 8:40 pm #10001AnonymousInactive
My customer feedback on Sparkfun regarding uSD & logging:
Almost a “Must Have”, needs a little more development:
about 15 minutes ago by Member #57950 verified purchaser / edit this review
Very well constructed, very accurate, very intuitive to use. The graphing function is lovely.
Doesn’t come with a manual, get that plus tips & tricks at: https://moosh.im/documentation/
This won’t replace your multimeter for immediate “one-off” measurements (you need a separate smartphone or tablet to get readings), but it is wonderful for remote sensing and watching volts/amps/ohms change with time & conditions.
The one major flaw, which I hope will be fixed in firmware soon, is that the logging function is effectively useless in the current device iteration- it only logs to a micro SD card (not included), and you can only retrieve the log by unscrewing the case and pulling the SD card out to read it on a separate computer- you cannot access the SD card, either physically or to transfer the data, from outside the case. There is no “read log data” function in the Android or iOS software.
The case in the currently shipping device does have a slot cut out for SD access (on one side), but unfortunately that access is blocked by a flap on the other side of the case. From the dialogue on the web site, I guess this is due to regulatory requirements for this high voltage test device. You can cut off this blocking flap, to access the SD without taking the case apart, but even then it is difficult to pull the SD out, because it doesn’t pop out far enough to easily grab, with the case in place. I solved that with a thin strip of adhesive tape attached to the uSD, sticking out of the case…
A much better solution would be for the logged data to be downloadable via Bluetooth to your display device, so that you would never need to mess with the SD card after installing it… I can’t imagine why that has not been implemented. A nearly fatal flaw, for a device otherwise perfectly designed as a remote sensing & logging instrument.
Still- a very nice and handy device, almost a must have for your tool bench…
- June 15, 2016 at 11:22 am #10169
Thanks Robert :)
And thank you Joel for the review! I agree with pretty much everything you wrote, especially about being able to pull logs out over BLE. You’re right this is on the to-do list. The last few weeks have been working on support in specific Android models (like the LG volt) and pushing on the iOS beta. One thing at a time…
- June 17, 2016 at 4:19 am #10245AnonymousInactive
It would be nice with faster logging rate also. Or am I doing something wrong?
With Logging Interval set to “No wait” I get max 1.6 samples per second.
I am using the new firmware 1466039460 and Android App Version 1.0.23(1849) and my SD card is a Kingston class 10 microSD HC I 1 FAT partitioned to only 32 MB/512 byte, supposed to have 10MBps Write speed.
- June 30, 2016 at 6:47 pm #10459
You’re using the logging feature correctly. With “no wait” selected, the meter will be sampling continuously and writing to the SD card, so the effective sample rate will depend on your buffer depth and sample rate settings. These are visible in the app at the bottom of the screen.
So, for example, if you have it set to 125Hz, 64samples, you’ll get about 64/125=0.512 seconds between log entries (in reality slightly longer because of calculation time and time spent writing to SD).
If you want to get even faster, you can manually raise the sample rate in the app before disconnecting.
Hope this helps